[1] The sands range from medium fine to coarse and contain a large proportion of shell grit.
[2][3] The clay of the Rupelian era developed to a depth of approximately 70 m (230 ft) beneath a deposit of Neogene sand.
[1] The formation has a Miocene Era aquifer, while the clay level dates to the Pliocene.
[4] A Pliocene species of auk (Alca stewarti) was found in 2000.
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